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15=w+2w
We move all terms to the left:
15-(w+2w)=0
We add all the numbers together, and all the variables
-(+3w)+15=0
We get rid of parentheses
-3w+15=0
We move all terms containing w to the left, all other terms to the right
-3w=-15
w=-15/-3
w=+5
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